ProcessHostMapPath.cs source code in C# .NET

                        Code:
                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / xsp / System / Web / Configuration / ProcessHostMapPath.cs / 2 / ProcessHostMapPath.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 
namespace System.Web.Configuration {
    using System.Configuration; 
    using System.Collections; 
    using System.Globalization;
    using System.Runtime.InteropServices; 
    using System.Xml;
    using System.Text;
    using System.Web.Caching;
    using System.Web.Util; 
    using System.Web.UI;
    using System.IO; 
    using System.Web.Hosting; 

    // 
    // Uses IIS 7 native config
    //
    internal sealed class ProcessHostMapPath  : IConfigMapPath, IConfigMapPath2 {
        IProcessHostSupportFunctions _functions; 
        object _mapPathCacheLock;
 
        static ProcessHostMapPath() { 
            HttpRuntime.ForceStaticInit();
        } 

        internal ProcessHostMapPath(IProcessHostSupportFunctions functions) {
            // if the functions are null and we're
            // not in a worker process, init the mgdeng config system 
            if (null == functions) {
                ProcessHostConfigUtils.InitStandaloneConfig(); 
            } 

            // we need to explicit create a COM proxy in this app domain 
            // so we don't go back to the default domain or have lifetime issues
            if (null != functions) {
                _functions = Misc.CreateLocalSupportFunctions(functions);
            } 

            // proactive set the config functions for 
            // webengine in case this is a TCP init path 
            if (null != _functions ) {
               IntPtr configSystem = _functions.GetNativeConfigurationSystem(); 
               Debug.Assert(IntPtr.Zero != configSystem, "null != configSystem");

               if (IntPtr.Zero != configSystem) {
                   // won't fail if valid pointer 
                   // no cleanup needed, we don't own instance
                   UnsafeIISMethods.MgdSetNativeConfiguration(configSystem); 
                } 
            }
            _mapPathCacheLock = new Object(); 
        }

        string IConfigMapPath.GetMachineConfigFilename() {
            return HttpConfigurationSystem.MachineConfigurationFilePath; 
        }
 
        string IConfigMapPath.GetRootWebConfigFilename() { 
            string rootWeb = null;
 
            if (null != _functions) {
                rootWeb = _functions.GetRootWebConfigFilename();
            }
 
            if (String.IsNullOrEmpty(rootWeb)) {
                rootWeb = HttpConfigurationSystem.RootWebConfigurationFilePath; 
            } 
            Debug.Trace("MapPath", "ProcHostMP.GetRootWebConfigFilename = " +
                    rootWeb); 

            Debug.Assert(!String.IsNullOrEmpty(rootWeb), "rootWeb != null or empty");

            return rootWeb; 
        }
 
        private void GetPathConfigFilenameWorker(string siteID, VirtualPath path, out string directory, out string baseName) { 
            directory = MapPathCaching(siteID, path);
            if (directory != null) { 
                baseName = HttpConfigurationSystem.WebConfigFileName;
            }
            else {
                baseName = null; 
            }
 
            Debug.Trace("MapPath", "ProcHostMP.GetPathConfigFilename(" + siteID + ", " + path + ")\n" + 
                    " result = " + directory + " and " + baseName + "\n");
        } 

        void IConfigMapPath.GetPathConfigFilename(
                string siteID, string path, out string directory, out string baseName) {
            GetPathConfigFilenameWorker(siteID, VirtualPath.Create(path), out directory, out baseName); 
        }
 
        // IConfigMapPath2 VirtualPath variant 
        void IConfigMapPath2.GetPathConfigFilename(
                    string siteID, 
                    VirtualPath path,
                    out string directory,
                    out string baseName) {
            GetPathConfigFilenameWorker(siteID, path, out directory, out baseName); 
        }
 
 
        void IConfigMapPath.GetDefaultSiteNameAndID(out string siteName, out string siteID) {
            Debug.Trace("MapPath", "ProcHostMP.GetDefaultSiteNameAndID\n"); 
            siteID = ProcessHostConfigUtils.DEFAULT_SITE_ID_STRING;
            siteName = ProcessHostConfigUtils.GetSiteNameFromId(ProcessHostConfigUtils.DEFAULT_SITE_ID_UINT);
        }
 

        void IConfigMapPath.ResolveSiteArgument(string siteArgument, out string siteName, out string siteID) { 
            Debug.Trace("MapPath", "ProcHostMP.ResolveSiteArgument(" + siteArgument + ")\n"); 

 
            if (    String.IsNullOrEmpty(siteArgument) ||
                    StringUtil.EqualsIgnoreCase(siteArgument, ProcessHostConfigUtils.DEFAULT_SITE_ID_STRING) ||
                    StringUtil.EqualsIgnoreCase(siteArgument, ProcessHostConfigUtils.GetSiteNameFromId(ProcessHostConfigUtils.DEFAULT_SITE_ID_UINT))) {
 
                siteName = ProcessHostConfigUtils.GetSiteNameFromId(ProcessHostConfigUtils.DEFAULT_SITE_ID_UINT);
                siteID = ProcessHostConfigUtils.DEFAULT_SITE_ID_STRING; 
            } 
            else {
                siteName = String.Empty; 
                siteID   = String.Empty;

                string resolvedName = null;
                if (IISMapPath.IsSiteId(siteArgument)) { 
                    uint id;
 
                    if (UInt32.TryParse(siteArgument, out id)) { 
                        resolvedName = ProcessHostConfigUtils.GetSiteNameFromId(id);
                    } 
                }
                // try to resolve the string
                else {
                    uint id = UnsafeIISMethods.MgdResolveSiteName(siteArgument); 
                    if (id != 0) {
                        siteID = id.ToString(CultureInfo.InvariantCulture); 
                        siteName = siteArgument; 
                        return;
                    } 
                }

                if (!String.IsNullOrEmpty(resolvedName)) {
                    siteName = resolvedName; 
                    siteID = siteArgument;
                } 
                else { 
                    siteName = siteArgument;
                    siteID = String.Empty; 
                }
            }

            Debug.Assert(!String.IsNullOrEmpty(siteName), "!String.IsNullOrEmpty(siteName), siteArg=" + siteArgument); 
        }
 
        private string MapPathWorker(string siteID, VirtualPath path) { 
            Debug.Trace("MapPath", "ProcHostMP.MapPath(" + siteID + ", " + path + ")\n");
            return MapPathCaching(siteID, path); 
        }

        // IConfigMapPath2 variant with VirtualPath
        string IConfigMapPath2.MapPath(string siteID, VirtualPath path) { 
            return MapPathWorker(siteID, path);
        } 
 
        string IConfigMapPath.MapPath(string siteID,  string path) {
            return MapPathWorker(siteID, VirtualPath.Create(path)); 
        }

        string IConfigMapPath.GetAppPathForPath(string siteID, string path) {
            VirtualPath resolved = GetAppPathForPathWorker(siteID, VirtualPath.Create(path)); 
            return resolved.VirtualPathString;
        } 
 
        // IConfigMapPath2 variant with VirtualPath
        VirtualPath IConfigMapPath2.GetAppPathForPath(string siteID, VirtualPath path) { 
            return GetAppPathForPathWorker(siteID, path);
        }

        VirtualPath GetAppPathForPathWorker(string siteID, VirtualPath path) { 
            Debug.Trace("MapPath", "ProcHostMP.GetAppPathForPath(" + siteID + ", " + path.VirtualPathString + ")\n");
 
            uint siteValue  = 0; 
            if (!UInt32.TryParse(siteID, out siteValue)) {
                return VirtualPath.RootVirtualPath; 
            }

            IntPtr pBstr = IntPtr.Zero;
            int cBstr = 0; 
            string appPath;
            try { 
                int result = UnsafeIISMethods.MgdGetAppPathForPath(siteValue, path.VirtualPathString, out pBstr, out cBstr); 
                appPath = (result == 0 && cBstr > 0) ? StringUtil.StringFromWCharPtr(pBstr, cBstr) : null;
            } 
            finally {
                if (pBstr != IntPtr.Zero) {
                    Marshal.FreeBSTR(pBstr);
                } 
            }
 
            return (appPath != null) ? VirtualPath.Create(appPath) : VirtualPath.RootVirtualPath; 
        }
 
        private string MapPathCaching(string siteID, VirtualPath path) {
            // store a single variation of the path
            VirtualPath originalPath = path;
 
            // Check if it's in the cache
            String              cacheKey    = CacheInternal.PrefixMapPath + siteID + path.VirtualPathString; 
            MapPathCacheInfo    cacheInfo   = (MapPathCacheInfo) HttpRuntime.CacheInternal.Get(cacheKey); 

            // If not in cache, add it to the cache 
            if (cacheInfo == null) {
                lock (_mapPathCacheLock) {
                    cacheInfo = (MapPathCacheInfo) HttpRuntime.CacheInternal.Get(cacheKey);
                    if (cacheInfo == null) { 
                        cacheInfo = new MapPathCacheInfo();
                        // Add to the cache: Valid for 10 minutes 
                        HttpRuntime.CacheInternal.UtcInsert(cacheKey, cacheInfo, null, DateTime.UtcNow.AddMinutes(10), Cache.NoSlidingExpiration); 
                    }
                } 
            }

            // If not been evaluated, then evaluate it
            if (!cacheInfo.Evaluated) { 
                lock(cacheInfo) {
                    if (!cacheInfo.Evaluated) { 
                        try { 

                            string physicalPath = null; 
                            uint siteIDValue;
                            if (UInt32.TryParse(siteID, out siteIDValue)) {
                                string siteName = ProcessHostConfigUtils.GetSiteNameFromId(siteIDValue);
                                physicalPath = ProcessHostConfigUtils.MapPathActual(siteName, path); 
                            }
                            if (physicalPath != null && physicalPath.Length == 2 && physicalPath[1] == ':') 
                                physicalPath += "\\"; 
                                // Throw if the resulting physical path is not canonical, to prevent potential
                                // security issues ( 

                            if (FileUtil.IsSuspiciousPhysicalPath(physicalPath)) {
                                throw new HttpException(SR.GetString(SR.Cannot_map_path, path));
                            } 

                            cacheInfo.MapPathResult = physicalPath; 
                        } catch (Exception e) { 
                            cacheInfo.CachedException = e;
                            cacheInfo.Evaluated=true; 
                            throw;
                        }

                        cacheInfo.Evaluated = true; 
                    }
                } 
            } 

            // Throw an exception if required 
            if (cacheInfo.CachedException != null) {
                throw cacheInfo.CachedException;
            }
 
            return MatchResult(originalPath, cacheInfo.MapPathResult);
        } 
 
        private string MatchResult(VirtualPath path, string result) {
            if (string.IsNullOrEmpty(result)) { 
                return result;
            }

            result = result.Replace('/', '\\'); 

            // ensure extra '\\' in the physical path if the virtual path had extra '/' 
            // and the other way -- no extra '\\' in physical if virtual didn't have it. 
            if (path.HasTrailingSlash) {
                if (!UrlPath.PathEndsWithExtraSlash(result)) { 
                    result = result + "\\";
                }
            }
            else { 
                if (UrlPath.PathEndsWithExtraSlash(result)) {
                    result = result.Substring(0, result.Length - 1); 
                } 
            }
 
            return result;
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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